Fire-grate for refuse-destructors and other furnaces.



G. & F. L. WATSON. Fm: GRATB FOR REFUSE DESTRUCTORS AND OTHER FURNACES.

APPLICATION FILED AUG. 23, 1912.

Patented Jan. 14, 1913.

o u o 0 o o UNITED STATES PATENT orFIoa.

GEORGE WATSON, or LONDON,

:ANDIRANK LESLIE WATSON, OF PERSHOBE, ENGLAND.

FIRE-GRATE FOR REFUSE-DESTRUCTORS AND OTHER FURNACES.

Application filed August 23, 1912. Serial No. #16560.

- Specification of Letters Patent.

Patented an. 1 1, 1913 T all ioho'm- 1' t may concern Grates for fication. v

Hitherto most of the successful destructors fortowin refuse have been based upon class of fuel as town refuse,

heavy labor and the eX-'- posure'of the workman to heat involved inv practically all the systems of drawing the The charging.

the principle of intermittent charging and clinker'ing, and, believing aswe do that theintermittent system as opposed-to continuous firing is mostsuitable for such a poor. we have soughtmeans to avoid the.

clinker hitherto employed. of such'furnaces is sometimes instantaneous when mechanical means of'chargi'ng are employ ed and sometimes by stages, when hand feeding is adopted, but in either case there results at the end of each burning perioda mass of hot and often molten clinker on the 3 [.grate which mustbe removed from the fur- 0 nace' inorder to start'a fresh fire... On withdrawingtlie mass of clinkerit is necessary 5 to leave within vthe furnace and ready to operation which has up cases provided I it can be tipped like grate, so much hot.

spread over the clean I not completely vitricinder-s and .other fuel fied, as :may-be necessary to ignite rapidly and -.thoroughly'the' next charge. It is this to now seemed to demand .;the' hand-skill and intelligent care of theworkman and which has prevented the use of a mechanicalgrate of the various known types. Bearing in mind that the mass of hot clinker may, in some instances weigh as much is or more than half a ton, and that it is desirable to draw it as quickly as possible so as not to interrupt the work- "ing of the furnace any longer than is necessary nor per'mit'the interior to cool down, manufacturers have in some movable grates capable of traveling on wheels to and from the furnace. Ive also proyide a movable grate mounted. on wheels but the arrangement such that a tipping trolley. It is also furnished with means of applying the blast and is provided with'appliances for keeping it cool.

of the furnace In the accompanying dxra wing ive have illustrated a movable grate n the form we prefer to employ fitted tojga refusedestructor of well known type.

Figure 1 is a sectional 2 is a cross section. a y v a I In the arrangement shown. the grate consists of a tipping truck. 'a.. mo unted on -four flanged wheels 1) running on rails c-laidinto the ashpit d and designed sIo-hsto-pass, easily into and out" of the furnace e and tofit loosely between the side walls f f-of the. furnace which may be made to ,overhang or offset inward above .the tipping truekasshown,

, thus causing allrefusefed into tjherfurnace eventually to fall int-0;;thei tipping truck and not over the edgethereof,":Theiblast of air produced by any known meanssuch as a blower fan or steam jetapparatus'is admitted to the: interior of the; truckbelow the grate by means ofa detachable. -connec.-- tion in a manner hereinafter more fullydescribed.

In the furnace at the backof the'tipping sired, is a deadplate, or aihearth which the truck is pushed. -M eans; onlooking the truck firmlyin positionfin'theIfurnace may be provided.butiareinotshown inthe drawing. V

The furnace of the furnace room for-ga oonsiderable height above the truck, the; refuse lying against the overhanging walls-0f thefurnace'. But as it burns down it' -will constant-lyfall into' the truck and fuse .down into clinker in which form it occupies..-only;;one quarter of its original bulk. filth-en the fire has reached that stagegiwhen most; of the refuse is converted 'intoolinker and only a small quantity of unfused cinder-sand-refuse remains on the top of the clinker lie-Stoker will open one or more-of the doorsflzl' fixed in the front wall. of the furnace above-the tipping truck, and push back. the loose cinders and other burning-fuel,-fnoin. off the top of the clinkeromtothe dadplate or hearth g. This will .le"avc.the'gclihker: level or approximately level-wit'li the top edge of the tipping truck which is' thcn ready to be drawn out and emptied. f..'hei i-:the jiipping truck is in position itxftir-m's part of the furnace and the ashpiteinayrbc .iclosrlby means of ado-or, not shown in the drawings. which may or may not be attached to the 7 being fed 'i n as uuailiiia g ner, the refusewill iatfirst. fill the interior truck or may be separately mounted. To remove the truck or grate this door, if there is one, is first opened and the blast is cut off from the "truck or grate by suitable-means. The tipping grate or truck is then drawn or pushed out on its rails in the direction of the arrow either by hand, or by suitable mechanical means, and taken to the clinker cooling yard, where it may be at once tipped and discharged. The same truck or another empty one in readiness is then run into the ashpit, and the loose fire from'ofl' the deadplate at the back is drawn forward by the -workman raking through the rake door or doors h before mentioned and spread in the bottom of the tipping truck or grate.- The new charge is then. put into thefurnace V and descends upon the hot fire in the bottom of the tipping truck. The blast is connected again and turned on and the fire soon again On referring to the drawings it will be seen that a'ti'pping. truck is provided with a double bottom, the air space between the inner and the outer casing being connected with the blast i. The outer casing j is solid and the, inner casing k is provided with suitable holes or airspaces for admit ting the blast to play upon the fire in the truck, this inner casing is thus forming. the grate. If prefer ed however a twyer may be laid in the b0 tom of the tipping truck To prevent distortion by the heat, we pre-' fer to make the shells or-casing's of the tipping truck or one of them corrugated form, in the drawings the outer shell or casing j is shown thus formed.

In the case where a twyer is .usedits' con-3 struction will depend on circumstances "such as the pressure of the blast required and the nature of the fuel.

In the drawings a pipe m is shown -titted to the truck which pipe may be used for introducingeither water or steam between the casings. p

The blast pipe is connected tothe tipping truck by a detachable joint and if infront the blast pipe maybe suitably hinged or made of metallic'flexible hose pipe so that it may be disconnected or removed when the truck has to be drawn from the ashpit.

Another convenient methodof connecting the blast pipe is ,as shown in the drawings, through the back of the furnace. In this case the-back wall of the furnace is provided with a cone-sl1aped nozzle 2', the orifice of 4 names to thisspecification in the a port Z in the tipping truck when the latter is pushed up hard against it. The tipping truck may be held in this position under pressure from a clamping screw or lever, not shown, working through. the front door of the ashpit. In this construction the blast pipe may be provided. with a valve which can be turned; off when the tipping truck is temporarily removed.

t is obvious that numerous changes might be resorted to in the structure and arrangements of the parts withoutdeparting from the spirit and scope of the invention.

larly as relatingto refuse destructors, but

tachments according to our invention. The

in detail anyone form.

Letters Patent of the United State'S is 1. In a refuse detructor orsimilar. fur nace having a combustion chamber the' combination of a wheeled carriage, .a grate carried thereby and removable therewith from the furnace, said grate being the sole grate provided for said combustion chamber, and

cooperative relation therewith andv for retammg heated cmders when thecarrlageis removed from the 'furnacc.' U

bination'of a wheeled carriage, a grate carried thereby and removable therewith from the furnace, the carriage being provided said grate-being the sole gratelprovided for said combustion chamber, and air blast supply means positioned and adapted to direct carriage is in position for the grate to constitutethe grate of the combustion chamber.

In testimony-whereof we have signed our presence of two subscribing witnesses.

GEORGE WATSON, FRANK LESLIE wATsoN.

Witnesses:

ALFRED S. BIsHor, HERBERT D. JAMEsoN. V Witnesses to the signature of Frank Leslie Watson: v

HENRY MAY,

. A. CULVERWELL.

any furnace where intermittent or succes-' 'sive burning is required maybe conveniently fitted with the moving grateand other at- What we claim and desire lto secure -by which is inside the wall and fits tightly into We have described our invention particu actual. construction of thetipping truck which constitutes the movable grate is capa-v ble of wide variation audit is :t -here'fore thought unnecessary to describe or'illustratei.

a deadplate or hearth. located above the r'e-v movable grate aforesaid and adapted for 2; In a refuse destructor or similar fur; nace having a combustion chamber, the comwith a closed chamber below the said grate,

an air blast to the closed chamber when the 

